Summer Sourdough Crushed Ice & Water Temp Chart for a Hot 80 Degree (80°F / 27°C) Kitchen — Stand Mixer Low Speed (78°F DDT)
4-factor Desired Dough Temperature (DDT) and 80 cal/g latent heat crushed-ice calculation for hitting 78°F dough in a hot 80°F room.
In a 80 degrees (26.7°C) kitchen (assuming flour and levain are also at 80 degrees) with Stand Mixer Low Speed (78°F DDT) (+8°F mechanical friction), the 4-factor DDT equation [4 × 78°F − (80 + 80 + 80 + 8)] requires a theoretical mix water temperature of 64°F (17.8°C). Because 64°F is colder than 76°F tap water, use the 80 cal/g latent heat of fusion formula: for a 350g water batch, mix 22g of finely crushed ice with 328g of tap water.
- Required Water Temp
- 64°F (17.8°C)To hit 78°F DDT in 80°F room
- 350g Batch Ice Split
- 22g Ice / 328g WBased on 76°F tap water & 80 cal/g latent heat
- Mixer Friction Factor
- +8°FStand Mixer Low Speed
- Target Final Dough Temp
- 78°F (25.6°C)Locks fermentation clock & protease rate
Water Temperature Solver: 80°F (26.7°C) Room, Stand Mixer Low Speed (78°F DDT) (+8°F)
Read the ice column as a direct instruction: weigh that much crushed ice and make up the balance with 76°F tap water.
| Total Water | Calculated Temp | Ice Quantity | Tap Water Quantity | Dough Temp Target |
|---|---|---|---|---|
| 400g recipe water — [Primary] | 64°F theoretical | 26g finely crushed | 374g from the tap at 76°F | final 78°F / 25.6°C |
| 350g recipe water — Small Mix | 64°F theoretical | 22g finely crushed | 328g from the tap at 76°F | final 78°F / 25.6°C |
| 250g recipe water — Standard Mix | 64°F theoretical | 16g finely crushed | 234g from the tap at 76°F | final 78°F / 25.6°C |
| 500g recipe water — Oversized Mix | 64°F theoretical | 32g finely crushed | 468g from the tap at 76°F | final 78°F / 25.6°C |
| 300g recipe water — Double Mix | 64°F theoretical | 19g finely crushed | 281g from the tap at 76°F | final 78°F / 25.6°C |
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Baking Sourdough in a Hot 80°F Room: Why You Need 64°F Water (22g Ice)
Friction is the variable bakers forget. Stand Mixer Low Speed (78°F DDT) contributes +8°F, and because that heat is generated inside the dough rather than supplied from the room, it cannot be compensated by simply lowering the water temperature of the flour. It has to be subtracted from the mix water before mixing begins.
Mixing temperature is not dough temperature. The 8°F allowance for stand mixer low speed (78°f ddt) assumes the heat is distributed through the mass rather than concentrated in the dough hook's path, so a slow first minute of mixing keeps the correction honest.
Thermal Control Protocol for Stand Mixer Low Speed (78°F DDT) in a 80°F Room
- Weigh the Full Water Load: For a 350g batch you need 328g of liquid water plus 22g of crushed ice. Set the scale up before you touch the flour.
- Chill the Water: Add the 22g of ice to the 76°F tap water and wait until the melt is complete so the temperature is stable when the flour arrives.
- Mix in Stand Mixer Low Speed (78°F DDT): Combine flour and water, then run the mixer for the full recommended time so the +8°F of mechanical heat is actually generated rather than assumed.
- Confirm 78°F: Probe the finished dough immediately. In a 26.7°C (80°F) kitchen the reading should land on 78°F ± 1°F.
Technical Q&A: Summer Sourdough Crushed Ice & Water Temp Chart
What if my kitchen is warmer than 26.7°C on the day I bake?
Recalculate rather than adjusting by feel. Every extra degree of room temperature demands roughly one degree less from the mix water, and in a warm room the 64°F figure can drop below freezing, at which point the ice route becomes unavoidable.
Should I probe the flour and levain separately?
Yes. The equation counts the flour and levain as 80 degrees each, and in a 80 degrees (26.7°C) kitchen a levain straight from the refrigerator can be 10°F cooler, which alone will miss the 78°F target.
How much colder is the water than the room in this 80°F (26.7°C) kitchen?
16°F below the room temperature of 80°F. That gap is the entire thermal load that 8°F of stand mixer low speed (78°f ddt) friction and 80°F ingredients impose on the mix water.